Balanced valve.



No. 880,920. PATENTED MAR. 3 1908.

' L. J'. RIGSBY.

BALANCED VALVE.

APPLICATION FILED JUNE 15,1907.

2 SHEETS-SHEET 1.

ATTORNEYS THE NORRIS PErERs co, wnsnmcmu. n. c,

PATENTED MAR. 3, 1908. I vL. J. RIGSBY.. BALANCED APPLICATION FILED VALVE,

II I m I a I M m WW M W Z W W U A A 3 PATENT FFTQE.

LEWIS J. RIGSBY, OF MANNING, TEXAS.

BALANCED VALVE Specification of Letters Patent.

Patented March 3, 1908.

Application filed June 15, 1907. Serial No. 379,168.

To all whom it may concern:

Be it known that I, Lnwis J. RIGsBY, a citizen of the United States, and a resident of Manning, in the county of Angelina and State of Texas, have invented a new and Improved Balanced Valve, of which the following is a full, clear, and exact description.

My invention relates to balanced valves for general use and more particularly to a type of valve suitable for use in sawmill mechanism for the purpose of manipulating the supply of steam, or similar elastic medium, to the part commonly designated as the shot gun.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 IS a side elevation showing part of the sawmill provided with the shot gun and with my improved valve and its connections, Fig. 2 is an enlarged central sec tion through my improved valve; Fig. 3 is an enlarged central section through my improved valve, the section being taken upon a plane at a right angle to the section shown in Fig. 2, this figure showing further the plug turned slightly to the right or in a clockwise direction according to the view shown in Fig. 1; and Fig. 4 is a central section similar to Fig. 3, but showing the valve plug as occupying its normal position representing the inactive condition of the shot gun.

A sawmill carriage is shown at 5, and mounted upon it are rests 6, 7, 8, 9 for the stock. The carriage is provided with wheels 10 engaging a track 11. A bracket 12 depends from the carriage, being secured rigidly thereto by bolts 13. The shot gun is shown at 14 and mounted upon it is a valve casing 15 provided with a removable face 16 bolted thereto, as indicated more particularly in Fig. 2. A lever 17 is connected with a pitman 18 whereby it may be shifted into different positions. This lever may also be moved by hand, as will be understood from Fig. 1.

A steam pipe is shown at 19 and leads to the valve casing 15. From the latter a pipe 20 leads to one end of the shot gun. An exhaust pipe is shown at 21 and at 22 a pipe leads from the casing 15 to the end of the shot gun opposite that to which the pipe 20 leads. The valve casing is provided with ports 23, 24, 25, 26, 27. Live steam is admitted through the port 23 and may pass out through either of the ports 24, 27. The ports 25, 26 are exhaust ports and communicate with the exhaust pipe 21. 1

A valve plug is shown at 28 and fits steamtight within the casing 15. This plug may be turned within certain limits, as will be understood from Figs. 1, 3 and 4. The valve plug is provided with webs 29, 30, each of arcuate cross section, and is further provided with passages 31, 32 which are bounded by the webs 29, 30. The plug is further provided with a central passage 33 enlarged at its lower end and still further enlarged at its upper end, as indicated in Figs. 3 and 4. Mounted within the upper end of this passage 33 are ribs 34, 35, each virtually dividing the upper end of the passage into smaller passages 36, 36, 37. Passages 33 and 36 are so proportioned as to balance each other. The passages 36", 37 are self-balancing.

The lever 17, in Fig. 1, normally stands perfectly upright, in which event the plug valve occupies the position indicated in Fig. 4. The lever being moved to the ri ht or in a clockwise direction, according to Fig. 1, the valve 28 appears as indicated in Fig. 3. In this case steam proceeds through the plug and ports 37, 24 to the pipe 20. The lever 17 being moved to the left, however, the steam proceeds through port 23, passages 36, 36 and port 27, to the pipe 22. When the steam passes through the plug and pipe 20 (see Fig. 3) the exhaust takes place from pipe 22 through port 27, passage 31, port 36, to the exhaust pipe. Vice versa when the live steam flows through the pipe 22 to the shot gun, the exhaust steam passes through port 24, passage 32, and port 25 into the exhaust pipe 21.

It will be noted that the valve above described is very evenly balanced.

When the valve is in operation the live steam has no tendency to press the valve plug in any particular direction or to cause it to bind within the casing. It will also be noted that the passage 33 extends entirely through the plug so as to permit the live steam pressure to exert itself in opposite directions. The room taken up by the ribs 34, 35 reduces the available area of the upper end of the passage 33 and thus prevents the plug from being forced downwardly.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1. In a balanced valve, the combination of a casing provided with a central space and with ports merging into said central space, and a valve plug provided with a pair of webs having two ends thereof bent outwardly and spaced far apart, said plug being further provided with a pair of ribs disposed interm' diate said last-mentioned ends, so as to form a plurality of ports disposed between said ends, said webs at their ends opposite said last-mentioned ports being separated so as to form a single port.

2. In a balanced valve, the combination of a casing provided with a central space of substantially cylindrical form and with a large inlet port merging into said space, said casing being further provided with a pair of exhaust ports disposed widely apart and connected together and merging into said central space, said casing being also provided with a pair of ports to be connected with opposite ends of a shot gun, said last-mentioned ports each being located intermediate one of said. exhaust ports and said inlet port, and a revoluble plug mounted within said central space, said plug being provided with a pair of Webs of arcuate form, said webs being spaced widely apart at one end thereof and close together at the opposite ends thereof so as to form a port between the ends last-mentioned, said plug being further provided with a pair of ribs disposed intermediate said webs and spaced therefrom to form ports, said ribs being spaced from each other so as to form a port of substantially the same area as said port intermediate the opposite ends of said webs. i

3. As an article of manufacture, a valve plug provided with a pair of webs of arcuate form disposed with their convex surfaces facing each other, said webs being rovided with ends disposed far apart, said p ug being fur ther provided with ribs disposed intermediate said last-mentioned ends and spaced therefrom so as to form ports and being spaced apart so as to leave a large port therebetween, the opposite ends of said webs being spaced apart far enough to leave a port of proper size to balance said large port.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEWIS J. RIGSBY. Witnesses O. E. DAOUS,

L. P. CAMPBELL. 

